DE1728050A1 - BACKLASH AND WEAR-COMPENSATING HIGH PRESSURE GEAR PUMP OR -ENGINE - Google Patents

Description

PATENT Attorney DIPL.-ING. OTTO BERMÜHLER

8 MUNICH II _{1 8/10/68}

DEGENPBLDSTRASSB 10 TELEPHONE 364151

Soiüibeik ttämbm 132.93

Deatiae Bank AG. MÄMi & eJt 35/31165

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RE: MY FILES 1 729 / J

ütto ü o k e r- 1 e, neck eh.

o Backlash and wear-compensating high-pressure gear -

pump ¹ OZWo engine.

JJie invention relates to a backlash and "wear-compensating High pressure gear pump "or motor with a driven Gear and one or more externally toothed gears meshing with this, their radial and axial limits of the pressure chamber by a

50.9 835/0363

sliding control piston and two lateral axially against the Gears pressable axial disks are formed, each -under the effect of the pressurized medium Pressure fields are available, according to patent (patent application

p 15 53030.0).

Such machines have the disadvantage that the wear ^ between the gear tip circles and the control piston is very great. Above all, it is difficult to adjust the size of the compensation pressure fields in such a way that the control piston is guaranteed to rest against the gear head circles in every phase of operation and that wear is achieved that is justifiable in terms of service life »Da das pressure field between the gears and the control baskets of the instantaneous position of the teeth depends, but these changes move, this üruckfeldo However, the dormant compensation pressure fields can not variably be trained * det. This means that if the compensation pressure fields are too small, the control piston periodically floats and if the compensation pressure fields are too large, excessive wear occurs.

The present invention is based on the task, a To create high-pressure gear pumps or motors in which the Compensation pressure fields can be made so large that there is certainly no floating away, with wear but should be kept within limits.

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As the reason for the high wear on the known machines the very small bearing surface of the control piston is that is represented by the tooth tips of the gears, is according to the invention proposed to connect the control piston with the axial disks and to support them on the gear shafts.

In order to be able to coordinate the tolerances, the parts are dimensioned in such a way that the control piston touches the * gears when the hay is in operation, but there is a slight play of 0.05 to 0.1 mm between the bores of the axial disks and the gear shafts passing through them » When the machine is running in, the sliding surface of the control piston wears out very quickly until the bores of the axial disks come into contact with the gear shafts recorded. The entire bearing surface is therefore a multiple of the original bearing surface, it increases by approx. Fourfold. The wear is therefore very low and can be neglected in the known machines was only supported on the moving bearing surface of the tooth tips

The drawings are exemplary embodiments of the object of the invention shown

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Figo 1 shows a section through a gear motor

along the line I - I in Fig »3»

Fig. 2 shows a section along the line II - II in Jfig «3> 3 shows a section along the license III - III

in Fig. 1 and

FIG. 4 shows a section along the line IV - IV in FIG. 5 shows a section along the line I - I in ^ Fig. 3j but with a different training

the radial pressure fields,
FIG. 6 shows a section along the line I - I in FIG

with another variant of the radial pressure fields and
Figo 7 is a section along the line II - II in Figure ₀

with the formation of the radial pressure fields accordingly

Figo 6.

According to Fig. 1, two W with gears 2 and 3 provided gear shafts 4 and 5 are arranged in the centrically turned housing 1, one of which is driven when the machine is used as a pump. On both sides of the gears there are control pistons 6 and 7 *, each of which is equipped with three circular lcompensation pressure springs 8, 9 and 10, which are connected to the pressure chamber 14 via ports 11, 12 and 13 and through pistons 15) 16 and 17 are sealed from high-strength plastic.

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The Aolben T5, 16 and 17 are on the inside diameter of the G-eb adjacent surface is hydrostatically relieved for a perfect To ensure that this piston can be adjusted «This is done, for example, with the piston 15 through a recess 18 in the piston, which is connected to the pressure chamber 14 via the bores 19 and 11. The hydrostatic relief is particular This is necessary because the direction of movement of the oteuerkolbens 6 or 7 is different from the possibility of movement the pistons 15, 16 and 17 ° - especially FIGS. 2 and 4 show sine: cylindrical pins 20 and 21 provided which the .Connect the control piston 6 and 7 with the axial washers 22 and 23 ,. The connection 24 is a leakage connection for a line to the tank, to drain the leakage oil.

The axial disks 22 and 23 could also consist of two halves. The dashed lines in i'ig. 2 show the outline of the axial Comp en sat ions druckf elder 25 and 26 <> The thrust washers have in Ixeuzustand only a small clearance to the gear shafts 4 and iirst 5 ° shrink after the games to the btellen 27 and 28 are respectively ₀ 27 ' and 28 * ^e j on the pressure side of the motor aufsrehoben.

The 5 ¹ Ig. 3 and 4 show the housing 1 with the cover in ^ '29 30, the cover 30 carries the ^ in and -auslaji-j-mschlüs se 31 and 32. The axial disks 22 and 23 point to the large pressure field facing away from the gear 25 and 26 or 25 'and

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26 'on. The sealing of these i'elder is done by means of O-rings 33 dull metal hangings (at high pressures) carried out, namely so that the axial washers 22 and 23 both with respect to the side surfaces of the gearbox as well as one between each the axial disks and the covers 29 and 30 inserted disk 34 or »35 are in a quasi" floating state "«

fc According to FIG. 5, the radial compensation of the control piston takes place 36 and 37 by two circular pistons 38 and 39 each Pressure fields via the bores 4-0 and 41 with the pressure space 42 stay in contact. The pistons 38 and 39 are supported Segments 43 and 44 which are inserted into the housing 1. This embodiment has the advantage that the possibility of movement of the pistons 38 and 39 is the same as that due to the deflection of the Gear shafts 4 and 5 required additional movement of the control piston 36 or 37.

Figo 6 shows another way of training the Control piston «In the control piston 45 and 46 are elongated, rectangular recesses are provided in which plastic bodies 47 and 48 are arranged, which serve as pistons. Using from plastic pistons for the radial compensation pressure fields one can see the, albeit low, plasticity of the Material to cap by providing a recess 49 on the side exposed to pressure, which then has a Sealing lip 50 formed

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In the "-Pig. 7 an embodiment of the axial disk 51 is shown, as it is, for example, at a T-umpe according to Fig. 6 can be used.

509835/0363

Claims (1)

Claims [1.j Backlash and wear-compensating high-pressure gear pump or motor with a driven gear and one or more externally toothed gears meshing with this, whose radial and axial boundary surfaces of the pressure chamber are controlled by a control column P which can be displaced against the tooth engagement ben and two lateral axial disks which can be pressed axially against the gears, each under the Effect of pressure fields acted upon by the pressure medium stand, according to patent (patent application P 15 53 O3O0O), characterized in that the control piston (6, 7) with the Axial disks (22, 23) is connected and this is on the Support gear shafts (4, 5) » 2. High pressure gear pump or »motor according to claim 1, characterized ^ marked that in the fire state between the gear shafts (4, 5) lind the bores in the axial disks (22, 23) small play of about 0.05 to 0.1 mm is provided High-pressure gear pump or motor according to Claims 1 and 2, characterized in that the axial disks (22, 23) both to the axial side surfaces of the gears (2, 3) and control piston (6, 7) as well as to the axial housing parts (29-30 or 34, 35) are hydrostatically relieved. _ 9 _ 509835/0363 172B050 4. High pressure gear pump or motor according to claims 1 to 3, characterized in that the connection between the control piston (6, 7) and axial washers (22, 23) using cylindrical pins (20, 21) takes place. 5 · High pressure gear pump or motor according to claims 1 to 4, characterized in that the housing bore is turned out concentrically to the toothing and on both sides of the gears (2, 3) Ö © ^ i ¹¹ with three circular! Compensations- ^ pressure springs (8, 9 »10) provided control piston (6, 7 ) is provided, the control piston, the axial disks and the ICompensationsdruckf eider are arranged symmetrically. 6. High-pressure gear pump or motor according to tests 1 to 5, characterized in that the Lompensationsdruckfeider (8, 9, 10) are sealed by loops (15, 16, 17), at the i-position by a recess (49) an ivichtlippe (50) formed iot .. i 7. High pressure gear pump or motor according to claims 1 to 6, characterized in that between control pistons (36, 37) and the housing bore! o segments (43, 44) are arranged. 3ο high pressure gear pump or motor according to claims 1 to 7, characterized in that the control piston (45, 46) only has a rectangular compensation pressure field in which a Piston (4?, 48) of the same profile is made of plastic 509835/0363 BATH ORIGINAL